Early Open Water Swim Practice

Not that I know of.  I don't think any of the reservoir swim beaches open until closer to Memorial Day.  The gravel pond tends to be very late May as well.  Grant Ranch is saying 5/18.

I do know there are hearty souls that swim early and late in the year so maybe someone else knows where they swim?

According to the COMSA site, 

Open Water Swimming at Chatfield State Park in the Gravel Pond

 Saturday 7:30 am to 10:00 am

Monday and Wednesday 4:30 pm to 7:00 pm
May 1 - September 30

You do have to be a member of COMSA to swim there.

correct open water at chatfield opens today haha. however, like the above poster mentioned you need to be a member of cosma and either bike in or have a park pass.

Just a little bit away is the grant ranch open water they have a website with more information however I do not have a link or know when it opens. Grant ranch has no requirements other than buying our pass.

Other than that I have herd about one possibly in cherry creek area??? and of course good old boulder.

REAL tough swimmers.  I am waiting for Grant Ranch to open (I will use a wetsuit!).  I should be able to get in a swim while in Orlando, FL on business in two weeks.  My hotel is about 1.5 miles from Cane Lake so I can do Lucky's Lake Swim (luckyslakeswim.com) one morning.  It is a widely known 1K OWS.

There was a picture in the Denver Post this morning of those people at the gravel pond yesterday

Cliff the guy without a wetsuit swims masters with me he is crazy and loves open water more than anything however going yesterday is beyond crazy haha

Its about time for me to put up my first post!---and believe me-a rank amateur. Seems to be a good time to join the crowd here!

 I have found that the Windsor Triatlon Club is planning to start a regular monday--- evening open water swim at the Water ValleyPelican Lakes golf course in Windsor. I too am going for my first ever triathlon at Union Reservoir on June 18th (Summer Open) and need to get some experience at some open water!! I'm going next monday 5:30-7:00 PM. You can contact them here:http://windsortriclub.com/w3c2013seasontraining.html

Seems to have a $10.00 drop in fee.

Word from the Union Reservoir ranger is that they could have trouble with having enough water to open the lake for swimming. They implied a possibility of having to drop the swim.